Exchange 2010 in sub domain

currently we have exchange 2003 sp2 in our environment, we want to test exchange 2010 before really installing with current exchange 2003.

so i create new child domain called child.ourdomain.com
i thought if i create child domain and installed exchange 2010 on it, it will be separated completely from the parent domain, but when i want to install exchange 2010 it require to select one exchange server and it discover the exch 2003 servers.

is it possible to install exchange 2010 in child domain without communicating with the current exch 2003 environment??? and if it is not possible what is the best topology to implement my needs??

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